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Exhaust gas purification system of working machine

  • US 10,371,027 B2
  • Filed: 04/25/2011
  • Issued: 08/06/2019
  • Est. Priority Date: 04/30/2010
  • Status: Expired due to Fees
First Claim
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1. An exhaust gas purification system comprising:

  • a common rail engine mounted to a working machine;

    an exhaust gas purification device coupled to an exhaust system of the common rail engine;

    at least one throttle device comprising an intake air throttle device and an exhaust gas throttle device coupled to intake and exhaust systems of the common rail engine; and

    an ECU configured to operate the common rail engine in;

    an auxiliary renewing mode in which a temperature of exhaust gas is raised based on actuation of the at least one throttle device,a forced renewing mode in which a fuel is supplied to the common rail engine using an injection timing based on a post injection time; and

    a mode selection input means which, in a case that a clogged state of the exhaust gas purification device is equal to or greater than a first prescribed level, is configured to indicate a mode selection between the auxiliary renewing mode or the forced renewing mode;

    wherein;

    in a case that an accumulated drive time of the common rail engine exceeds a set time, the forced renewing mode is executed regardless of the clogged state of the exhaust gas purification device; and

    in a case that the accumulated drive time of the common rail engine is less than the set time and the clogged state of the exhaust gas purification device is greater than or equal to the first prescribed level, either the auxiliary renewing mode or the forced renewing mode is executed based on the indicated mode selection of the mode selection input means; and

    when the clogged state of the exhaust gas purification device is not improved after execution of the auxiliary renewing mode, the forced renewing mode is executed regardless of the indicated mode selection of the mode selection input means.

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